PIC18F2455-I/SP Microchip Technology Inc., PIC18F2455-I/SP Datasheet - Page 38

• Manufacturer Part Number: PIC18F2455-I/SP
• Description: Microcontroller; 24 KB Flash; 2048 RAM; 256 EEPROM; 24 I/O; 28-Pin-SPDIP
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F2455-I/SP

• A/d Inputs: 10-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 12 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 23
• Interface: I2C/SPI/USART/USB
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 28-pin SPDIP
• Programmable Memory: 24K Bytes
• Ram Size: 2K Bytes
• Speed: 48 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC18F2450/4450
FIGURE 3-3:
FIGURE 3-4:
DS39760A-page 36
Note 1:
Peripheral
Program
Counter
INTRC
OSC1
Clock
Clock
CPU
Note 1:
CPU Clock
Peripheral
PLL Clock
Program
Counter
Output
INTRC
OSC1
Clock transition typically occurs within 2-4 T
Clock
2:
Q1
SCS1:SCS0 bits Changed
T
Clock transition typically occurs within 2-4 T
OST
Q2
TRANSITION TIMING TO RC_RUN MODE
PC
TRANSITION TIMING FROM RC_RUN MODE TO PRI_RUN MODE
= 1024 T
Q3
Q4
OSC
Q1
Q1
; T
T
PLL
1
OST (1)
= 2 ms (approx). These intervals are not shown to scale.
PC
2
Q2
Advance Information
Clock Transition
3
T
PLL
OSC
OSTS bit Set
Q3
(1)
.
OSC
PC + 2
(1)
n-1
.
Q4
n
Q1
1
Transition
2
Clock
(2)
n-1 n
Q2
PC + 2
Q3
Q2
Q4
© 2006 Microchip Technology Inc.
Q3 Q4
Q1
Q1
PC + 4
Q2
PC + 4
Q2
Q3
Q3